import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
pf={}
for i in range(2,int(n**0.5)+1):
  while n%i==0:
    pf[i]=pf.get(i,0)+1
    n//=i
if n>1:
  pf[n]=1
nn=sum(pf.values())
if nn<=2:
  print("NO")
else:
  print("YES")